Python Package to interface with Radio Shack's 2200087 Multimeter
This is a Python Package to interface with Radio Shack’s 2200087 Multimeter.
The 2200087 is an inexpensive DMM which supports logging and graphing data on a computer, but the supplied code only supports Windows. This is a python package to allow for connecting to the multimeter over USB on Linux or Mac OSX. Due to radioshack not supplying any serial specifications, the protocol was reverse engineered by David Dworken from simply observing the output of the DMM.
The serialDecoder module and the serial protocol documentation is essentially a slightly tweaked version of the script written and maintained by David Dworken, available at https://github.com/ddworken/2200087-Serial-Protocol.git
This package includes a version of the serialDecoder module, slightly refactored to allow it to be imported into other python scripts. It also includes a runner module which contains a Twisted protocol, wrapped by Crochet. This module should be relatively easier to include into other python scripts and applications.
This package has been tested only with python 2.7.
This package can be installed from pypi using pip:
$ pip install driver2200087
Or using easy_install (python 2.7 only):
$ easy_install driver2200087
Standalone usage is listed in the documentation, and should be fairly straightforward to follow.
The serialDecoder module can also be imported and used from within a python script, and the documentation can help you use it in that manner.
The recommended way for using the package, though, is through the runner module which it provides. The simpler form of use is to get the latest available value whenever necessary. A short example of how this can be done using this package in a typical python application would be
from driver2200087 import runner dmm = runner.InstInterface2200087() dmm.connect() # Other Application code # ... # # And when the measurement is required : if dmm.data_available() > 0: print dmm.latest_point() else: raise Exception # Or pass, or retry, as per application requirements # other application code # ...
If the application calls for continuous recording of the data, the following is likely a better approach
from driver2200087 import runner dmm = runner.InstInterface2200087() dmm.connect() while True: if dmm.data_available() > 0: print dmm.next_point()
Note that in this code snippet, the python interpreter is blocked by the infinite while loop. This is not required by the module. As long as dmm.next_point() is called often enough (10 Hz), you can use whatever mechanism you like to actually make the call. Note that dmm.data_available() must be checked by your application before making the call, or you should trap the exception that results.
Making the call at less than this frequency will cause data points to be lost when the point buffer fills up - if your application only calls for the occasional measurement, you’re probably better off with dmm.latest_point() instead.
For an example of using the runner module from within a larger framework by subclassing the provided twisted protocol, see the corresponding Tendril module. The Tendril module, while WIP, also includes examples of parsing the obtained datapoint strings into usable values.
Downloads and Documentation
The simplest way to obtain the source for this package is to clone the git repository:
git clone https://github.com/chintal/driver2200087.git driver2200087
You can install it as usual, with:
python setup.py install
The latest version of the documentation can be found at ReadTheDocs.
driver2200087 is distributed under the GPLv2 license.
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